The Essentials ofComputer(computer) 472

The Essentials ofComputer(computer) 472 - 10.2 THE BASIC...

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10.2 THE BASIC COMPUTER PERFORMANCE EQUATION You have seen the basic computer performance equation several times in previous chapters. This equation, which is fundamental to measuring computer perform- ance, measures the CPU time: time program = time cycle × cycles instruction × instructions program where the time per program is the required CPU time. Analysis of this equation reveals that CPU optimization can have a dramatic effect on performance. We have already discussed several ways to increase performance based on this equa- tion. RISC machines try to reduce the number of cycles per instruction, and CISC machines try to reduce the number of instructions per program. Vector processors and parallel processors also increase performance by reducing CPU time. Other ways to improve CPU performance are discussed later in this chapter. CPU optimization is not the only way to increase system performance. Mem- ory and I/O also weigh heavily on system throughput. The contribution of mem- ory and I/O, however, is not accounted for in the basic equation. For increasing
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